What would you suggest that I buy?

I already own a Canon Rebel T2i. I only have the 18-55 mm lens that came with it though. No other equipment. What lenses & other equipment would you suggest I buy in the immediate future for outdoor portrait photography? I have heard of telephoto lenses, macro lenses, lighting equipment, and I of course plan to buy a tripod. I'm thinking an extra battery & bigger memory card would be smart. Any editing software? I'm pleased with my pictures before I edit them but I like to play around with different editing tools but I'm tired of my limited software I currently use. Just looking for suggestions, thanks! *Please be specific on names & models of items*